all protein/low carb diets are not good for you! Your body needs all 3 macro-nutrients to survive -- carbohydrates, protein and fat. If you cut out one of those macro-nutrients your body will not function properly and eventually break down.
Eat whole, naturally occuring foods. Nothing processed, packaged or anything with added sugar, salt, artificial sweetners or preservatives.
At the grocery store look for foods with just 1 ingredient...not a list of words you can't even pronounce.
Live by this quote: "If you can't hunt it, fish it, pick it from a tree, bush or the ground, DON'T eat it."